Crossword Genius

Happy occasion for Doris the left-wing landlady? (3-6,3)

Ross

I believe the answer is:

red-letter day

I'm a little stuck... Click here to teach me more about this clue!

'happy occasion' is the definition.
'red letter day' can be an answer for 'occasion' (I have seen 'Important occasion' mean 'red letter day' so perhaps 'occasion' could also mean 'red letter day'). I am not sure about the 'happy' bit.

'doris the left-wing landlady?' is the wordplay.
I cannot really understand how this works, but
'doris' could be 'day' (I've seen this in other clues) and 'day' is found in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
'left' could be 'red' (I've seen this in other clues) and 'red' is found in the answer.
'wing' could be 'r' (r is abbreviation for right) and 'r' is found in the answer.
This explanation may well be incorrect...

'for' acts as a link.

Can you help me to learn more?

(Other definitions for red-letter day that I've seen before include "Great occasion" , "Memorable occasion" , "Memorably important occasion" , "Noteworthy time" , "Special date in the calendar" .)

I've seen this clue in the Sydney Morning Herald.
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